Electric lamp.



PATENTED AUG. 30, 1904. E. L. ELLIOTT.

ELECTRIC LAMP.

APPLICATION FILED JUNE 5, 1903- NO MODEL.

UNITED STATES,

Patented August 30, 1904.

PATENT ()rrrce.

ELIAS L. ELLIOTT, OF NEIV YORK, N. Y., ASSIGNOR TO ILLUMINATINGENGINEERING COMPANY, OF NEW YORK, N. Y.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 768,847, dated August30, 1904,

Application filed. June 5, 1903. Serial No. 160,218. (No model.)

To all w/wnt it 777/6117] concern:

Be it known that I, ELIAS L. ELLrTT,a citizen of the United States.residing at New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Electric Lamps, ofwhich the following is a specification.

This invention relates toineandescent electric lamps.

The object of the invention is to improve the mechanism of a lamp havinga plurality of filaments or circuits, so that a large or small light maybe shown or both may be extinguished; and the invention consists incertain constructions and combinations of elements, substantially ashereinafter set forth and claimed.

Figure 1 is a broken side elevation, partly in section, showing a lampaccording to the present invention. .Fig. 2 is a cross-section of sameon line 2 2, Fig. 1. Fig. 3 is an enlarged detail cross-section of ringand rotating mechanism. Fig. A is a perspective View of perforated ring.

The numeral 1 indicates a lamp-socket of usual construction. A metallicshell or adapter 2 is screwed into this socket. The porcelain or similarbase 3 of the lamp screws into this adapter when the parts areconnected. The adapteris insulated from the cap 4. Cap 4 hascontact-pieces 5 5, which make contact with the cap 6 of the lamp inusual manner. The adapter is in circuit with the return or groundcurrent. A wire 7 leads from the cap 6 to one end of each of twofilaments 8 9. The outer ends of these filaments are connected to twocontact-pieces 10 and 11 (extending at around the neck of the lamp willbring an arm 13 into contact with one of the contactpiecessay l0thusclosing circuit through the filament 9 and illuminating the lamp bymeans of the large filament. A further turn of the ring breaks thiscircuit, but brings another arm 13 into contact with piece 11, thusclosing circuit through the short filament and lighting the lowpowerlamp, while extinguishing the larger one. A still further turn breaksboth circuits, putting both filaments out, and a further movementrepeats the sequence-that is, a bright light, a small light, and nolight.

The ring 12 is to be rotated constantly in one direction, and as aconvenient means for causing such rotation I will describe the mechanismillustrated more clearly in Figs. 3 and 4.. The ring 12 has holes orratehets, which holes are in number multiples of three. A pawl 21 ismountedon wire 22, which partly encircles the adapter, and is drawn backby a spring 23, connected to the adapter. The inner end of pawl 21passes through a slot 2 1 in the adapter in position to enter one of theholes in ring 12. A pull on the outer end of pawl 21 in the direction ofthe arrows, Figs. 2 and 3, will draw the nose of the pawl into one ofthe holes 20 in ring 12 and if continued will move the ring 12rotatively about the stem of the lamp until the pawl reaches the end ofslot 24:, which will stop the pawl and the rotation of the ring 12. Thismovement of ring 12 will have changed the position of arms 13, carryingone out of engagement with contact-piece 10 and another into engagementwith contact-piece 11 or carrying all arms 13 out of engagement, as thecase may be. Pawl 21 is pulled by acord 25, and when this cord isreleased the pawl will be drawn back by spring 23 into position where itmay enter the next hole or ratchet 20 in the ring. Thus repeated pullson the cord 25 will shunt the circuits to light one filament, thenextinguish that and light the other, and then extinguish both. A casingor covering 26 extends Over the pawl and spring to protect theratchet-and-pawl mechanism. The pawl 21 extends through a slot 27 inthis casing, and a loop 28, connected to the casing, may serve as aguide to cord 25.

When the lamp is screwed into the adapter, it must come to a definedstopping-place, so that the circuits bear the proper relation to eachother. This may be effected by the abutment of the caps 4 and 6 or inany other suitable way to secure proper adjustment.

Lamps are known which can be turned high or low by a rotative movementof the lamp. This necessitates taking hold of the lamp, which isobjectionable. Other lamps are known in which a swinging switch may beoperated in one direction by one cord and in another direction byanother cord, which is liable to lead. to mistakes. My arrangement ofrepeated pulls in one direction to produce the desired sequence ofevents is considered advantageous. WVhat 1 claim is 1. The combinationwith a lamp having a non-conducting base provided with electricalcontact-pieces, of a ring surrounding said base and having contact-arms,and a pawl-andratchet mechanism for rotating said ring by a series ofimpulses.

The combination with a lamp-base having contact-pieces, a metallic ringsurrounding the same and having engaging contactarms, a ratchet-and-pawlmechanism for moving said ring, and a casing covering said rotativemechanism.

3. The combination of a threaded lampsocket, threaded adapter enteringthe same, lamp-base having contact projections at its sides, a ringsurrounding the lamp-base and having contact-arms, a ratchet-and-pawlmechanism for rotating said ring, and a casing covering said pawlmechanism.

In testimony whereof I afiix my signature in presence of two witnesses.

ELIAS L. ELLIOT T.

\Vitnesses:

BURT T. BAKER, JAMES L. BAKER.

